Today's @FirefoxNightly supports #rgba and #rrggbbaa color values in CSS. Hopefully shipping in Firefox 49.

May 9, 2016 · 4:35 PM UTC

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Replying to @davidbaron
.@davidbaron FINALLY! Was this inspired by @AXRProject? What about #rgbaa ? It's prob the one I use most in my experiments
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@veosotano 1. Don't think so. 2. No -- it's probably too confusing to read. Just use #rrggbbaa (double the r, g, and b digits).
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Replying to @davidbaron
@davidbaron Timely! I was literally just reading groups.google.com/a/chromium…. Awesome to see it already in @FirefoxNightly.
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Replying to @davidbaron
@davidbaron It seems like yesterday that I first suggested it on www-style – others may have done so earlier – but it’s been over 13 years.
Replying to @davidbaron
.@davidbaron e.g. #00005, for very soft drop shadows